CN113513446A - Formula of speeding and shaking piezoelectricity wind energy air current energy collection device - Google Patents
Formula of speeding and shaking piezoelectricity wind energy air current energy collection device Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D5/00—Other wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D15/00—Transmission of mechanical power
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/10—Combinations of wind motors with apparatus storing energy
- F03D9/11—Combinations of wind motors with apparatus storing energy storing electrical energy
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- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/185—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators using fluid streams
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a galloping type piezoelectric wind energy airflow energy collecting device. The wind pressure detection device comprises a piezoelectric cantilever beam unit, a wind pressure detection unit, a bottom plate, a shell, a cantilever beam rotating unit and a cantilever beam telescopic unit; the rear end of the piezoelectric cantilever beam unit is provided with a wind pressure detection unit, the shell is arranged above the bottom plate, an installation inner cavity is formed between the bottom plate and the shell, the rear end of the piezoelectric cantilever beam unit is connected with the cantilever beam rotating unit and the cantilever beam telescopic unit, and the cantilever beam rotating unit and the cantilever beam telescopic unit are installed and connected on the bottom plate. The wind speed sensor has the function of driving the position and the posture of the power generation element to be adjusted to the maximum power generation efficiency, the orientation of the piezoelectric cantilever beam is controlled while the wind direction of the fluid is measured, the wind speed can be measured, the natural frequency of the piezoelectric cantilever beam is changed by utilizing wind speed data, and the maximization of the output power is realized.
Description
Technical Field
The invention relates to a wind power generation device in the field of piezoelectric power generation, in particular to a relaxation vibration type piezoelectric energy collecting device for supplying energy to microelectronic equipment by utilizing wind energy airflow.
Background
When some dielectrics in nature are deformed by external force in a certain direction, polarization phenomenon occurs in the dielectrics, and charges with opposite polarities appear on two opposite surfaces of the dielectrics. When the external force is removed, it returns to an uncharged state, and this phenomenon is called the positive piezoelectric effect. In practical application, the wafer substance with piezoelectric effect can be used to convert the mechanical energy in the environment into micro-electric energy.
Researchers at the university of Clemon (Masana Ravindra and Daqaq Mohammed F.. Electromechanical Modeling and Nonlinear Analysis of Axially Loaded Energy Harvesters [ J ]. Journal of Vibration and Acoustics,2011,133(1)) studied the effect of axial preload on cantilever softening and stiffening. The designed energy receiver consists of a thin steel beam clamped at one end and a piezoelectric sheet on the upper surface of the thin steel beam. An initial axial displacement is generated at one end of the cantilever beam system. Research has shown that axial preload can be used to adjust, increase electrical damping and amplify the effect of external excitation. Researchers at Cambridge university, UK (JIA, YU, SESHIA, ASHWIN A.. Power Optimization by Mass Tuning for MEMS Piezoelectric Cantilever Tuning [ J ]. Journal of Microelectromechanical Systems: A Joint IEEE and ASME Publication on Micromicroscopes, Microactivators, Microlasers, and Microsystems,2016,25(1):108-117.DOI: 10.1109/JMEMS.2015.2496346) found that adding a Mass near the free end of the micro Cantilever beam significantly improved the Power response capability of the Vibration Energy harvester per unit acceleration. However, the containment of the mass comes at the expense of the active piezoelectric area. By numerically and experimentally investigating this compromise and exploring the best mass to cantilever length ratio for power maximization, it was found that end masses of about 60% -70% of the total cantilever length were optimal in linear response and they were significantly better than similar cantilevers with 40% and 50% end masses.
Sag is the aerodynamic negative damping component that is generated due to flow separation and vortex shedding, resulting in destabilizing vibration of the elongated structure. The galloping type piezoelectric wind energy airflow energy collecting device mainly comprises a support, a piezoelectric cantilever beam and a choking body. Two piezoelectric cantilever beams with the same size are arranged in parallel, one end of each piezoelectric cantilever beam is fixedly connected with the support through a bolt and a clamping piece, and the other end of each piezoelectric cantilever beam is fixedly connected with the flow blocking body of the square column through a bolt and a free end of each piezoelectric cantilever beam. The working principle of the collector is as follows: when wind airflow load acts on the choking body, and the wind speed exceeds a critical value, the choking body is subjected to aerodynamic force to generate transverse galloping under the action of streaming, so that the piezoelectric cantilever beam is driven to vibrate together, the piezoelectric element generates strain, and the vibration energy is converted into electric energy through the piezoelectric effect.
The output power of the galloping type piezoelectric wind energy airflow energy collecting device is influenced by a series of factors such as the natural frequency of the piezoelectric cantilever beam, the size of a bluff body, the input wind speed and the like. And the closer the frequency of the input mechanical vibration of the energy collecting device is to the natural frequency of the piezoelectric cantilever beam, the higher the output power is. Controlling the natural frequency of the piezoelectric cantilever is a very important task.
Disclosure of Invention
In order to solve the problems existing in the background technology, the invention mainly provides a piezoelectric wind energy airflow energy collecting device utilizing a galloping principle.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention comprises a piezoelectric cantilever beam unit, a wind pressure detection unit, a bottom plate, a shell, a cantilever beam rotating unit and a cantilever beam telescopic unit; the rear end of the piezoelectric cantilever beam unit is provided with a wind pressure detection unit, the shell is arranged above the bottom plate, an installation inner cavity is formed between the bottom plate and the shell, the rear end of the piezoelectric cantilever beam unit is connected with the cantilever beam rotating unit and the cantilever beam telescopic unit, and the cantilever beam rotating unit and the cantilever beam telescopic unit are installed and connected on the bottom plate.
The cantilever beam rotating unit comprises a hollow upright post, a beam hollow post, a large gear and a small gear; the rear end of the piezoelectric cantilever beam is sleeved in the beam hollow column, the beam hollow column is horizontally arranged, the hollow upright column is vertically arranged, and the upper end of the hollow upright column is fixedly connected with the beam hollow column; a large gear and a small gear are mounted on the bottom plate and are meshed and connected with each other, the lower end of the hollow upright post and the large gear are coaxially and rotatably connected through a key, the large gear is meshed with the small gear, and the small gear is coaxially and fixedly connected with an output shaft of the first steering engine; the cantilever beam telescopic unit comprises a first connecting rod, a second connecting rod, a third connecting rod and a second steering engine; the coaxial suit of second connecting rod activity is in hollow stand, the second connecting rod includes second connecting rod first half and second connecting rod latter half, second connecting rod first half lower extreme and second connecting rod latter half upper end coaxial rotatable be connected, first connecting rod upper end penetrates behind the hollow post of crossbeam articulated with piezoelectric cantilever beam rear end, first connecting rod lower extreme penetrates behind the hollow stand to be connected with second connecting rod first half upper end, second connecting rod latter half lower extreme is worn out behind the hollow stand and is articulated with the one end slip of third connecting rod, the output rigid coupling of the third connecting rod other end and second steering wheel, second steering wheel and bottom plate fixed connection.
The upper end of the first connecting rod penetrates through a horizontal strip-shaped groove in the bottom surface of the hollow beam column and then is hinged to the rear end of the piezoelectric cantilever beam, and the lower end of the first connecting rod penetrates through a vertical strip-shaped groove in the side wall of the hollow upright column and then is hinged to the upper end of the upper half part of the second connecting rod, so that a connecting rod sliding structure is formed between the rear end of the piezoelectric cantilever beam and the upper end of the upper half part of the second connecting rod through the hollow beam column, the first connecting rod and the hollow upright column.
The lower end of the lower half part of the second connecting rod is hinged with the sliding block barrel, and one end of the third connecting rod movably penetrates through the sliding block barrel.
The third connecting rod mainly comprises a block positioned at one end and a square hole positioned at the other end, the outer diameter of the block is larger than the inner diameter of the sliding block cylinder, and the square hole is mainly matched with a square shaft of a steering engine shaft on the second steering engine in a sleeved mode.
The piezoelectric cantilever beam consists of a flow blocking body, a metal cantilever beam and a tail cylinder, wherein the flow blocking body is cylindrical, the flow blocking body is fixedly connected with the front end of the metal cantilever beam, the rear end of the metal cantilever beam is fixedly connected with the front end of the tail cylinder, the tail cylinder is sleeved in a hollow column of the crossbeam in a penetrating manner, the rear end of the tail cylinder penetrates through two sides of the hollow column of the crossbeam and is fixedly provided with a wind pressure detection unit base, a wind pressure detection unit is arranged on the wind pressure detection unit base, the rear end of the tail cylinder penetrates through the bottom surface of the hollow column of the crossbeam and is fixedly provided with a hinged lug seat, and the hinged lug seat is used for hinging the upper end of a first connecting rod; piezoelectric films are attached to the upper surface and the lower surface of the metal cantilever beam and are connected with an external energy storage device through leads.
The base of the wind pressure detection unit at the rear end of the piezoelectric cantilever beam penetrates out of the end part of the hollow column of the beam and is connected with the wind pressure detection unit, and the wind pressure detection unit mainly comprises a detection plate and a pressure sensor under the detection plate.
The invention has two freedom degrees of movement, one is that a steering engine controls a pair of straight gears, and a large gear is connected with a hollow upright post connected with a cantilever beam, thereby realizing the control of the orientation of the cantilever beam. The other one adopts a connecting rod mechanism, and a connecting rod is controlled by a steering engine, so that the connecting rod connected with the upper sliding block of the connecting rod can move up and down in the hollow upright post, and the piezoelectric cantilever beam can move back and forth by moving up and down. The rear side of the hollow upright post is also provided with an opening, so that the connecting rod can conveniently extend out to be connected with the piezoelectric cantilever beam. The connecting rod inside the hollow upright post is divided into an upper part and a lower part, the upper part and the lower part can rotate, and therefore when the orientation of the piezoelectric cantilever beam changes, the length of the cantilever beam can be controlled by the steering engine.
Because the wind force piezoelectric energy collecting device can change the length of the piezoelectric cantilever beam, the natural frequency of the cantilever beam can be changed by utilizing the effect, and the natural frequency of the piezoelectric cantilever beam can be kept consistent with the frequency of wind input. The piezoelectric cantilever beam is forced to vibrate in the process of generating electricity, and the vibration frequency of the piezoelectric cantilever beam is integral multiple of the vibration frequency of wind input, so that the maximum output power can be kept to a certain extent as long as the input frequency of the piezoelectric cantilever beam is consistent with the input frequency.
The invention has the beneficial effects that:
the invention has the function and the effect of adjusting the mechanical structure and has the function of driving the position and the posture of the airflow power generation element to be adjusted to the maximum power generation efficiency.
The device can measure the wind direction of the fluid and control the orientation of the piezoelectric cantilever beam, can also measure the obtained wind speed and change the natural frequency of the piezoelectric cantilever beam by using wind speed data, thereby realizing the maximization of the output power.
Drawings
FIG. 1 is a schematic perspective view of an embodiment of the present invention;
FIG. 2 is a schematic view of a cantilever beam telescoping unit in an embodiment of the present invention;
FIG. 3 is a schematic view of a cantilever beam rotation unit in an embodiment of the present invention;
FIG. 4 is a schematic diagram of a first link structure according to an embodiment of the present invention;
FIG. 5 is a schematic view of a piezoelectric cantilever according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a second link structure according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a third link according to an embodiment of the present invention;
fig. 8 is a schematic view of a hollow column in an embodiment of the invention.
In the figure: the piezoelectric cantilever beam unit 1, the wind pressure detection unit 2, the bottom plate 4, the housing 3, the first connecting rod 5, the second connecting rod upper half 6, the second connecting rod lower half 7, the slider barrel 8, the third connecting rod 9, the second steering engine 10, the stud 11, the key 12, the hole 13, the hole 14, the hole 15, the hollow upright post 16, the first steering engine 17, the gearwheel 18, the pinion 19, the cylindrical bluff body 20, the metal cantilever beam 21, the tail cylinder 22, the wind pressure detection unit base 23, the hinged ear seat 24, the hinged ear seat 25, the hinged ear seat 26, the hinged ear seat 27, the hole 28, the shaft 29, the hinged ear seat 30, the bluff block 31, the square hole 32, the groove 33, the horizontal strip-shaped groove 34, the vertical strip-shaped groove 35, the hollow column 36 of the crossbeam, the key groove 37, the hole 38.
Detailed Description
The invention is further illustrated by the following examples and figures.
Referring to fig. 1, the device comprises a piezoelectric cantilever beam unit 1, a wind pressure detection unit 2, a bottom plate 4, a shell 3, a cantilever beam rotation unit and a cantilever beam expansion unit;
the rear end installation wind pressure detecting element 2 of piezoelectricity cantilever beam unit 1 has installed shell 3 in the top of bottom plate 4, forms the installation inner chamber between bottom plate 4 and the shell 3, and the screw that is connected between bottom plate 4 and the shell 3 on also mainly passing hole 13 and the shell 3 through the screw cooperates, and the main effect of shell 3 is that the part of protection bottom plate 4 top does not receive outside environmental impact. The rear ends of the piezoelectric cantilever beam units 1 are connected with the cantilever beam rotating units and the cantilever beam telescopic units, and the cantilever beam rotating units and the cantilever beam telescopic units are installed and connected on the bottom plate 4.
The piezoelectric cantilever beam unit 1 is driven to rotate through the cantilever beam rotating unit, and the piezoelectric cantilever beam unit 1 is driven to do telescopic motion through the cantilever beam telescopic unit.
The cantilever beam telescopic unit main body is arranged below the bottom plate, and the piezoelectric cantilever beam unit is moved mainly by controlling the connecting rod mechanism. The cantilever beam steering unit main body is arranged above the bottom plate, and the problem of front and back stretching of the cantilever beam can not be influenced while the steering of the piezoelectric cantilever beam unit is controlled. The wind pressure detection unit is arranged behind the piezoelectric cantilever beam unit, and the wind direction and the wind speed of the fluid are judged by using the numerical values of the pressure detected at two sides.
Referring to fig. 3, the cantilever beam rotation unit mainly comprises a gear transmission structure, including a hollow upright post 16, a beam hollow post 36, a bull gear 18, and a pinion 19; the back end of the piezoelectric cantilever beam 1 is sleeved in a beam hollow column 36, referring to fig. 8, the beam hollow column 36 is horizontally arranged, the hollow column 16 is vertically arranged, and the beam hollow column 36 and the hollow column 16 are vertically arranged, both are hollow and are not communicated with each other. The upper end of the hollow upright post 16 is fixedly connected with the beam hollow post 36; a large gear 18 and a small gear 19 are mounted on the bottom plate 4, the large gear 18 is meshed with the small gear 19, the lower end of the hollow upright post 16 is coaxially and rotatably connected with the large gear 18 through a key 12, the large gear 18 is meshed with the small gear 19, and the small gear 19 is coaxially and fixedly connected with an output shaft of a first steering engine 17; the bottom plate 4 is provided with a hole 14, and a shaft of the pinion 19 is sleeved in the hole 14 to form a hinged installation.
The operation of first steering wheel 17 drives pinion 19 and rotates, and gear wheel 18 can carry out the rotation of opposite direction, and then coaxial drive hollow stand 16 rotates, and then drives piezoelectric cantilever beam 1 rotatory through the hollow post 36 transmission of crossbeam for piezoelectric cantilever beam 1 can turn to suitable direction.
Referring to fig. 2, the cantilever beam telescoping unit comprises a first connecting rod 5, a second connecting rod, a third connecting rod 9 and a second steering engine 10; the second connecting rod is movably and coaxially sleeved in the hollow upright post 16, the second connecting rod simultaneously penetrates through the hole 15 of the bottom plate 4, the second connecting rod comprises a second connecting rod upper half part 6 and a second connecting rod lower half part 7, the second connecting rod upper half part 6 and the second connecting rod lower half part 7 are both sleeved in the hollow upright post 16, the lower end of the second connecting rod upper half part 6 is coaxially and rotatably connected with the upper end of the second connecting rod lower half part 7, when the piezoelectric cantilever beam 1 rotates, the second connecting rod upper half part 6 is driven to rotate relative to the second connecting rod lower half part 7, but the lower end of the second connecting rod upper half part 6 and the second connecting rod lower half part 7 are coaxially and synchronously lifted up and down.
Referring to fig. 6, the second link is mainly composed of the upper half 6 of the second link and the lower half 7 of the second link, wherein the hinge ear seat 27 of the upper half 6 of the second link mainly cooperates with the hinge ear seat 26 of the first link, and the hole 28 is partly composed of two holes of different diameters, wherein the hole deep is of larger diameter. This hole mainly cooperates with the axle 29 of the lower half 7 of the second connecting rod, and the axle with the larger diameter above the axle 29 mainly acts as the condition of disjointing not taking place while the second connecting rod moves up and down while cooperating with the hole 28, and simultaneously when the hollow upright 16 rotates, the second connecting rod can also work normally. To facilitate assembly, this portion of the shaft 29 is composed primarily of a flexible material. The hinge ear 30 of the lower half 7 of the second link cooperates with the slider barrel 8 so that the second link can move up and down inside the hollow upright 16 when the third link 9 is rotated.
The upper end of the first connecting rod 5 penetrates through the hollow column 36 of the cross beam and then is hinged with the rear end of the piezoelectric cantilever beam 1, the lower end of the first connecting rod 5 penetrates through the hollow column 16 and then is connected with the upper end of the upper half part 6 of the second connecting rod in the hollow column 16, and therefore the up-and-down movement of the second connecting rod in the hollow column 16 is transmitted to the piezoelectric cantilever beam 1 through the first connecting rod 5; the lower end of the lower half portion 7 of the second connecting rod penetrates through the hollow upright post 16 and then is in sliding hinge connection with one end of a third connecting rod 9, the other end of the third connecting rod 9 is fixedly connected with the output end of a second steering engine 10, and the second steering engine 10 is fixedly connected with the bottom surface of the bottom plate 4 through a stud 11.
The upper end of the first connecting rod 5 penetrates through a horizontal strip-shaped groove 34 in the bottom surface of a hollow beam column 36 and then is hinged to the rear end of the piezoelectric cantilever beam 1, the lower end of the first connecting rod 5 penetrates through a vertical strip-shaped groove 35 in the side wall of the hollow upright column 16 and then is hinged to the upper end of the upper half part 6 of the second connecting rod, so that the rear end of the piezoelectric cantilever beam 1 and the upper end of the upper half part 6 of the second connecting rod are connected through the hollow beam column 36, the first connecting rod 5, the hollow upright column 16 and a connecting rod sliding structure, the first connecting rod 5 is inserted between the hollow upright column 16 and the hollow beam column 36, and the rear end of the piezoelectric cantilever beam 1 and the upper end of the upper half part 6 of the second connecting rod are connected in a hinged mode through the first connecting rod 5.
Detailed description of the preferred embodimentreferring to fig. 5, the first connecting rod 5 essentially has two hinge ear seats, an upper hinge ear seat 25 and a lower hinge ear seat 26, wherein the upper hinge ear seat 25 cooperates with the hinge ear seat 24 of the piezoelectric cantilever 1 and the lower hinge ear seat 26 cooperates essentially with the hinge ear seat 27 of the upper half 6 of the second connecting rod. The main function is to convert the up-and-down movement of the second connecting rod into the back-and-forth movement of the piezoelectric cantilever beam 1.
The lower end of the second lower connecting rod half 7 is hinged with the sliding block barrel 8, and one end of the third connecting rod 9 movably penetrates through the sliding block barrel 8, so that the lower end of the second lower connecting rod half 7 is hinged with one end of the third connecting rod 9 in a sliding mode.
when the second steering engine 10 rotates anticlockwise, one end of the third connecting rod 9 connected with the slider barrel 8 is driven to move downwards, so that the second connecting rod is driven to move downwards in the hollow upright post 16, the rear end of the piezoelectric cantilever beam 1 is pulled to move forwards through the first connecting rod 5, the piezoelectric cantilever beam 1 extends forwards from the cross beam hollow post 36, and the effective length of the piezoelectric cantilever beam 1 is increased;
when the second steering engine 10 rotates clockwise, the third connecting rod 9 is driven to be connected with one end of the sliding block barrel 8 to move upwards, so that the second connecting rod is driven to move upwards in the hollow upright post 16, the rear end of the piezoelectric cantilever beam 1 is pulled to move backwards through the first connecting rod 5, the piezoelectric cantilever beam 1 retracts backwards from the hollow cross beam post 36, and the effective length of the piezoelectric cantilever beam 1 is reduced.
The cantilever beam telescopic unit mainly comprises a connecting rod mechanism, the connecting rod mechanism can be restrained by parts such as the hollow upright post 16 and the bottom plate 4, and when the hollow upright post 16 rotates, the connecting rod mechanism can normally work.
The effective length of the piezoelectric cantilever 1 is the length extending from the beam hollow post 36.
Referring to fig. 7, the third connecting rod 9 mainly comprises a block 31 at one end and a square hole 32 at the other end, the outer diameter of the block 31 is larger than the inner diameter of the slider cylinder 8, and the block 31 mainly acts to prevent the slider cylinder 8 on the third connecting rod 9 from being separated when the third connecting rod 9 rotates; the square hole 32 is mainly in fit with a square shaft of a steering engine shaft on the second steering engine 10, so that the steering engine shaft is not easy to slip when rotating.
Referring to fig. 4, the piezoelectric cantilever beam 1 is composed of a spoiler 20, a metal cantilever beam 21 and a tail cylinder 22, wherein the spoiler 20 is cylindrical, the spoiler 20 is fixedly connected with the front end of the metal cantilever beam 21, the rear end of the metal cantilever beam 21 is fixedly connected with the front end of the tail cylinder 22, the tail cylinder 22 is sleeved in the hollow beam column 36 in a penetrating manner, a wind pressure detection unit base 23 is fixedly arranged at the rear end of the tail cylinder 22, which penetrates through the two sides of the hollow beam column 36, the wind pressure detection unit base 23 is used for mounting the wind pressure detection unit 2, a hinge lug 24 is fixedly arranged at the rear end of the tail cylinder 22, which penetrates through the bottom surface of the hollow beam column 36, and the hinge lug 24 is used for hinging the upper end of the first connecting rod 5; piezoelectric films are attached to the upper surface and the lower surface of the metal cantilever beam 21 and connected with an external energy storage device through wires. The piezoelectric film is driven to deform by the vibration of the metal cantilever beam 21, and then mechanical energy is converted into electric energy to be output to the energy storage device.
The choke body 20 is designed in a cylindrical shape so that the choke body mainly forms a vortex-induced vibration effect with flowing air, so that the amplitude of the piezoelectric cantilever can be larger.
The metal cantilever beam 21 is of a sheet-shaped structure, PTZ-5A piezoelectric films are attached to the upper side and the lower side of the cantilever beam, the two piezoelectric films are connected with an energy storage device through wires, and meanwhile the two piezoelectric films are connected in series by means of the metal cantilever beam.
The tail cylinder 22 can be mated with the beam hollow post 36 so that the piezoelectric cantilever 1 can move back and forth under the control of the linkage. The hinge ear seat 24 can be fitted with a hinge shaft to a hinge ear seat 25 in the first link 5.
As shown in fig. 8, the tail cylinder 22 of the piezoelectric cantilever 1 can pass through the beam hollow post 36 and slide inside. The horizontal strip-shaped grooves 33 are symmetrically arranged on two sides of the beam hollow column 36, and the main function of the grooves 33 is to enable the wind pressure detection unit base 23 of the piezoelectric cantilever beam not to be blocked by the lateral surface of the transverse part when the piezoelectric cantilever beam 1 moves back and forth. The bottom surface of the beam hollow column 36 is provided with a horizontal strip-shaped groove 34, and the horizontal strip-shaped groove 34 ensures that the hinge lug seat 24 is not blocked by the bottom surface of the transverse part when the piezoelectric cantilever beam 1 moves back and forth.
The side wall of the upper end of the hollow upright post 16 is provided with a vertical strip-shaped groove 35, and the vertical strip-shaped groove 35 is used for facilitating the first connecting rod 5 to extend out of the hollow upright post 16 to be matched with the hinge lug groove 24 of the piezoelectric cantilever beam 1; the bore 38 at the bottom end of the hollow upright 16 is a longitudinal section of bore which allows the second link to move up and down within the hollow upright 16. The bottom end of the hollow upright post 16 is provided with a key slot 37, the key slot 37 is a key slot of the key 12, and the mounting key 12 and the gearwheel 18 are coaxially matched and mounted through the key slot 37 and the key 12.
The end part of the wind pressure detection unit base 23 at the rear end of the piezoelectric cantilever beam 1, which penetrates out of the hollow column 36 of the cross beam, is connected with the wind pressure detection unit 2 in an installing manner, and the wind pressure detection unit 2 mainly comprises a detection plate and a pressure sensor under the detection plate.
When wind blows on the detection plate, the detection plate can be subjected to pressure, and the pressure sensor can detect the pressure and transmit the data to the control center.
As shown in fig. 3 and 8, the cantilever beam rotation unit mainly controls the hollow upright column 16 by the steering engine control gear set, and the rotation of the hollow upright column 16 can control the orientation of the piezoelectric cantilever beam 1. When the first steering engine 17 controls the pinion 19 to rotate, the bull gear 18 rotates in the opposite direction to drive the hollow upright post 16 to rotate, so that the piezoelectric cantilever beam 1 can rotate in the proper direction.
The wind blows through the cylindrical choke body 20 to generate vibration, and then drives the metal cantilever beam 21 and the piezoelectric film thereon to reciprocate up and down for periodic vibration deformation, so that the mechanical energy of the vibration deformation is converted into electric energy to generate electricity.
The length of the metal cantilever beam 21 extending out of the beam hollow column 36 is related to the amplitude of the metal cantilever beam 21, and the wind speed is also related to the amplitude of the metal cantilever beam 21. Under a certain wind speed, the length of the metal cantilever beam 21 extending out of the hollow column 36 of the cross beam is matched with the wind speed, so that the maximum amplitude of the metal cantilever beam 21 is realized, and the vibration deformation of the metal cantilever beam 21 forms a resonance relation with the wind speed.
According to the invention, the cylindrical choke body 20 is adjusted to face a better wind speed direction at a certain wind speed through the cantilever beam rotating unit and the cantilever beam telescopic unit, and the length of the metal cantilever beam 21 extending out of the hollow column 36 of the cross beam is adjusted, so that the amplitude of the metal cantilever beam 21 is maximized, the vibration deformation of the metal cantilever beam 21 forms a resonance relation with the wind speed, and the maximum power generation efficiency is achieved.
Referring to fig. 1 to 8, the cantilever beam steering apparatus can not only freely control the orientation of the cantilever beam, but also fix the orientation of the cantilever beam. The cantilever beam telescopic unit can change the length of the cantilever beam, so that the natural frequency of the cantilever beam is changed, the frequency of mechanical vibration generated after wind airflow blows through a choking body can be kept consistent with the natural frequency of the cantilever beam, and resonance is formed.
The wind pressure detection unit can detect wind speeds on two sides of the piezoelectric cantilever beam, and when the wind speeds and the pressures on the two sides are different, the direction of the piezoelectric cantilever beam is inconsistent with the direction of the wind speed. The surface of the detector with high wind pressure points to one side with low wind pressure as a direction, the piezoelectric cantilever beam rotates in the direction, when the wind pressure values at the two sides are the same, the wind direction of the cantilever beam is consistent with that of the fluid, and the measured wind speed is the actual wind speed.
Claims (7)
1. The utility model provides a formula of galloping piezoelectricity wind energy air current energy collection device which characterized in that: the wind pressure sensor comprises a piezoelectric cantilever beam unit (1), a wind pressure detection unit (2), a bottom plate (4), a shell (3), a cantilever beam rotating unit and a cantilever beam telescopic unit; the wind pressure detecting unit (2) is installed at the rear end of the piezoelectric cantilever beam unit (1), the shell (3) is installed above the bottom plate (4), an installation inner cavity is formed between the bottom plate (4) and the shell (3), the rear end of the piezoelectric cantilever beam unit (1) is connected with the cantilever beam rotating unit and the cantilever beam telescopic unit, and the cantilever beam rotating unit and the cantilever beam telescopic unit are installed and connected on the bottom plate (4).
2. The galloping piezoelectric wind energy flow energy collecting device of claim 1, wherein:
the cantilever beam rotating unit comprises a hollow upright post (16), a beam hollow post (36), a large gear (18) and a small gear (19); the rear end of the piezoelectric cantilever beam (1) is sleeved in a beam hollow column (36), the beam hollow column (36) is horizontally arranged, the hollow upright column (16) is vertically arranged, and the upper end of the hollow upright column (16) is fixedly connected with the beam hollow column (36); a large gear (18) and a small gear (19) are mounted on the bottom plate (4), the large gear (18) and the small gear (19) are meshed and connected, the lower end of the hollow upright post (16) is coaxially and rotatably connected with the large gear (18) through a key (12), the large gear (18) is meshed with the small gear (19), and the small gear (19) is coaxially and fixedly connected with an output shaft of a first steering engine (17);
the cantilever beam telescopic unit comprises a first connecting rod (5), a second connecting rod, a third connecting rod (9) and a second steering engine (10); the second connecting rod is movably and coaxially sleeved in the hollow upright post (16) and comprises a second connecting rod upper half part (6) and a second connecting rod lower half part (7), the lower end of the second connecting rod upper half part (6) is coaxially and rotatably connected with the upper end of the second connecting rod lower half part (7), the upper end of the first connecting rod (5) penetrates through the hollow cross beam column (36) and then is hinged with the rear end of the piezoelectric cantilever beam (1), the lower end of the first connecting rod (5) penetrates through the hollow upright post (16) and then is connected with the upper end of the second connecting rod upper half part (6), the lower end of the second connecting rod lower half part (7) penetrates through the hollow upright post (16) and then is hinged with one end of the third connecting rod (9) in a sliding mode, the other end of the third connecting rod (9) is fixedly connected with the output end of the second steering engine (10), and the second steering engine (10) is fixedly connected with the bottom plate (4).
3. The galloping piezoelectric wind energy flow energy collecting device according to claim 2, wherein:
the upper end of the first connecting rod (5) penetrates through a horizontal strip-shaped groove in the bottom surface of the hollow beam column (36) and then is hinged to the rear end of the piezoelectric cantilever beam (1), and the lower end of the first connecting rod (5) penetrates through a vertical strip-shaped groove in the side wall of the hollow column (16) and then is hinged to the upper end of the upper half part (6) of the second connecting rod, so that the rear end of the piezoelectric cantilever beam (1) and the upper end of the upper half part (6) of the second connecting rod are connected through the hollow beam column (36), the first connecting rod (5), the hollow column (16) and a connecting rod sliding structure.
4. The galloping piezoelectric wind energy flow energy collecting device according to claim 2, wherein:
the lower end of the lower half part (7) of the second connecting rod is hinged with the sliding block barrel (8), and one end of the third connecting rod (9) movably penetrates through the sliding block barrel (8).
5. The galloping piezoelectric wind energy flow energy collecting device according to claim 2, wherein:
the third connecting rod (9) mainly comprises a block (31) located at one end and a square hole (32) located at the other end, the outer diameter of the block (31) is larger than the inner diameter of the sliding block cylinder (8), and the square hole (32) is mainly matched with a square shaft of a steering engine shaft on the second steering engine (10) in a sleeved mode.
6. The galloping piezoelectric wind energy flow energy collecting device according to claim 2, wherein:
the piezoelectric cantilever beam (1) is composed of a flow blocking body (20), a metal cantilever beam (21) and a tail cylinder (22), the flow blocking body (20) is cylindrical, the flow blocking body (20) is fixedly connected with the front end of the metal cantilever beam (21), the rear end of the metal cantilever beam (21) is fixedly connected with the front end of the tail cylinder (22), the tail cylinder (22) is sleeved in a cross beam hollow column (36) in a penetrating manner, two sides of the rear end of the tail cylinder (22), penetrating out of the cross beam hollow column (36), are fixedly provided with wind pressure detection unit bases (23), the wind pressure detection unit bases (23) are used for installing wind pressure detection units (2), the rear end of the tail cylinder (22) penetrates out of the bottom surface of the cross beam hollow column (36) and are fixedly provided with hinged lug seats (24), and the hinged lug seats (24) are used for hinging the upper end of a first connecting rod (5); piezoelectric films are attached to the upper surface and the lower surface of the metal cantilever beam (21) and are connected with an external energy storage device through leads.
7. The galloping piezoelectric wind energy flow energy collecting device according to claim 3, wherein:
the wind pressure detection unit base (23) of piezoelectric cantilever beam (1) rear end wear out the tip installation connection wind pressure detection unit (2) behind the hollow post (36) of crossbeam, wind pressure detection unit (2) mainly comprise pick-up plate and the pressure sensor under the pick-up plate.
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|---|---|---|---|---|
| JPH11303726A (en) * | 1998-04-23 | 1999-11-02 | Murata Mfg Co Ltd | Piezoelectric wind power generator |
| JP2014004875A (en) * | 2012-06-22 | 2014-01-16 | Japan Aerospace Exploration Agency | Noise reducing method and noise reducing device of rotating body |
| CN105840426A (en) * | 2016-03-18 | 2016-08-10 | 杭州电子科技大学 | Elastic rod vortex-induced vibration wind power generation device |
| CN111852771A (en) * | 2020-07-29 | 2020-10-30 | 西南石油大学 | Small wind power generation device and method adaptive to wind direction and wind speed |
| CN212958943U (en) * | 2020-06-17 | 2021-04-13 | 广州大学 | Energy conversion device and collection system based on piston wind |
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2021
- 2021-07-30 CN CN202110870489.8A patent/CN113513446B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11303726A (en) * | 1998-04-23 | 1999-11-02 | Murata Mfg Co Ltd | Piezoelectric wind power generator |
| JP2014004875A (en) * | 2012-06-22 | 2014-01-16 | Japan Aerospace Exploration Agency | Noise reducing method and noise reducing device of rotating body |
| CN105840426A (en) * | 2016-03-18 | 2016-08-10 | 杭州电子科技大学 | Elastic rod vortex-induced vibration wind power generation device |
| CN212958943U (en) * | 2020-06-17 | 2021-04-13 | 广州大学 | Energy conversion device and collection system based on piston wind |
| CN111852771A (en) * | 2020-07-29 | 2020-10-30 | 西南石油大学 | Small wind power generation device and method adaptive to wind direction and wind speed |
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